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 #include &lt;QtGui&gt;
 #include &lt;math.h&gt;

 #include &quot;starrating.h&quot;

 const int PaintingScaleFactor = 20;

 StarRating::StarRating(int starCount, int maxStarCount)
 {
     myStarCount = starCount;
     myMaxStarCount = maxStarCount;

     starPolygon &lt;&lt; QPointF(1.0, 0.5);
     for (int i = 1; i &lt; 5; ++i)
         starPolygon &lt;&lt; QPointF(0.5 + 0.5 * cos(0.8 * i * 3.14),
                                0.5 + 0.5 * sin(0.8 * i * 3.14));

     diamondPolygon &lt;&lt; QPointF(0.4, 0.5) &lt;&lt; QPointF(0.5, 0.4)
                    &lt;&lt; QPointF(0.6, 0.5) &lt;&lt; QPointF(0.5, 0.6)
                    &lt;&lt; QPointF(0.4, 0.5);
 }

 QSize StarRating::sizeHint() const
 {
     return PaintingScaleFactor * QSize(myMaxStarCount, 1);
 }

 void StarRating::paint(QPainter *painter, const QRect &amp;rect,
                        const QPalette &amp;palette, EditMode mode) const
 {
     painter-&gt;save();

     painter-&gt;setRenderHint(QPainter::Antialiasing, true);
     painter-&gt;setPen(Qt::NoPen);

     if (mode == Editable) {
         painter-&gt;setBrush(palette.highlight());
     } else {
         painter-&gt;setBrush(palette.foreground());
     }

     int yOffset = (rect.height() - PaintingScaleFactor) / 2;
     painter-&gt;translate(rect.x(), rect.y() + yOffset);
     painter-&gt;scale(PaintingScaleFactor, PaintingScaleFactor);

     for (int i = 0; i &lt; myMaxStarCount; ++i) {
         if (i &lt; myStarCount) {
             painter-&gt;drawPolygon(starPolygon, Qt::WindingFill);
         } else if (mode == Editable) {
             painter-&gt;drawPolygon(diamondPolygon, Qt::WindingFill);
         }
         painter-&gt;translate(1.0, 0.0);
     }

     painter-&gt;restore();
 }</pre>
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